Today Tuseday , my post is gate guard，it is responsible for registering pass in and out car and people，it rained and wind  so heavily that clothes were blown off.

int main()
{
  int a = 1;
  int* p = &a;
  printf("%p\n",p);
  *p = 2;
  printf("%d\n",a);
  return 0;
}
#define MAX(x,y) (x>y?x:y)
int main()
{
  int a = 2;
  int b = 3;
  int c = MAX(a,b);
  printf("%d\n",c);
  return 0;
}